Rob Griffith, Bayer
Peer Review: Geoff Robertson and David Gregor, Bayer CropScience
Grass weeds are becoming incrementally harder to control as post emergent herbicide resistant weed populations evolve in the Mallee. Three seasons of trials on a water repellent soil at Lowaldie, SA evaluated pre-emergent herbicide use in wheat, including Sakura, to take the pressure off post-emergent options. Field trials in the Mallee have indicated pre-emergent herbicides can give variable control. The pre-emergent herbicide Sakura has excellent activity on a range of problem grass weeds including barley grass, annual ryegrass and suppression of brome grass. The level of weed control of Sakura is influenced by moisture before and after sowing. Water repellent soil adds another complicating factor, particularly if the soil is moist at sowing and rainfall following seeding does not move the herbicide to where weed seeds are germinating.